vuejs2.0實現一個簡單的分頁
阿新 • • 發佈:2019-01-03
實現的分頁結果如圖所示:
css
.page-bar{
margin:40px;
}
ul,li{
margin: 0px;
padding: 0px;
}
li{
list-style: none
}
.page-bar li:first-child>a {
margin-left: 0px
}
.page-bar a{
border: 1px solid #ddd;
text-decoration: none;
position: relative;
float: left;
padding: 6px 12px ;
margin-left: -1px;
line-height: 1.42857143;
color: #337ab7;
cursor: pointer
}
.page-bar a:hover{
background-color: #eee;
}
.page-bar a.banclick{
cursor:not-allowed;
}
.page-bar .active a{
color: #fff;
cursor: default;
background-color: #337ab7;
border-color: #337ab7 ;
}
.page-bar i{
font-style:normal;
color: #d44950;
margin: 0px 4px;
font-size: 12px;
}
模版
<div class="page-bar">
<ul>
<li v-if="cur>1"><a v-on:click="cur--,pageClick()">上一頁</a></li>
<li v-if="cur==1"><a class="banclick" >上一頁</a></li>
<li v-for="index in indexs" v-bind:class="{ 'active': cur == index}">
<a v-on:click="btnClick(index)">{{ index }}</a>
</li>
<li v-if="cur!=all"><a v-on:click="cur++,pageClick()">下一頁</a></li>
<li v-if="cur == all"><a class="banclick">下一頁</a></li>
<li><a>共<i>{{all}}</i>頁</a></li>
</ul>
</div>
js
var pageBar = new Vue({
el: '.page-bar',
data: {
all: 20, //總頁數
cur: 1,//當前頁碼
});
呼叫 new Vue({引數}) 就是建立了一個基本的元件,賦值給變數 pageBar.
el就是element的縮寫,定位模版的位置.data就是資料了.
知道了總頁數但是要顯示頁碼還是要一番計算,所以顯示頁碼就是計算屬性了.
所以我們要用computed
computed: {
indexs: function(){
var left = 1;
var right = this.all;
var ar = [];
if(this.all>= 5){
if(this.cur > 3 && this.cur < this.all-2){
left = this.cur - 2
right = this.cur + 2
}else{
if(this.cur<=3){
left = 1
right = 5
}else{
right = this.all
left = this.all -4
}
}
}
while (left <= right){
ar.push(left)
left ++
}
return ar
}
}
看一下頁面顯示出來的迴圈:
<li v-for="index in indexs" v-bind:class="{ 'active': cur == index}">
<a v-on:click="btnClick(index)">{{ index }}</a>
</li>
v-for是迴圈渲染輸出計算屬性indexs.每一次迴圈的子元素賦值給index v-bind:class繫結class,當渲染到目前的角標的時候加個class v-on:click是綁定了事件,我把index當引數傳進入了,後面做判斷,預設傳event事件.然後我們給Vue的選項裡面再增加methods欄位
methods: {
btnClick: function(data){//頁碼點選事件
if(data != this.cur){
this.cur = data
}
},
pageClick: function(){
console.log('現在在'+this.cur+'頁');
}
}
元件互動
元件寫完了,問題來了,使用者點擊發生頁面改變,你怎麼通知其他元件作出相應的變化. 可以在頁角發生改變的函式下,插一條語句通知其他元件。不過這種方法是很差的做法。可以使用
watch: {
cur: function(oldValue , newValue){
console.log(arguments);
}
}
觀察了cur資料當它改變的時候,可以獲取前後值。然後通知其他元件。
完整的程式碼
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
<meta charset="utf-8">
<title></title>
<meta name="keywords" content="" />
<meta name="description" content="" />
<script type="text/javascript" src="js/vue.min.js"></script>
<style>
.page-bar{
margin:40px;
}
ul,li{
margin: 0px;
padding: 0px;
}
li{
list-style: none
}
.page-bar li:first-child>a {
margin-left: 0px
}
.page-bar a{
border: 1px solid #ddd;
text-decoration: none;
position: relative;
float: left;
padding: 6px 12px;
margin-left: -1px;
line-height: 1.42857143;
color: #337ab7;
cursor: pointer
}
.page-bar a:hover{
background-color: #eee;
}
.page-bar a.banclick{
cursor:not-allowed;
}
.page-bar .active a{
color: #fff;
cursor: default;
background-color: #337ab7;
border-color: #337ab7;
}
.page-bar i{
font-style:normal;
color: #d44950;
margin: 0px 4px;
font-size: 12px;
}
</style>
</head>
<body>
<div class="page-bar">
<ul>
<li v-if="cur>1"><a v-on:click="cur--,pageClick()">上一頁</a></li>
<li v-if="cur==1"><a class="banclick">上一頁</a></li>
<li v-for="index in indexs" v-bind:class="{ 'active': cur == index}">
<a v-on:click="btnClick(index)">{{ index }}</a>
</li>
<li v-if="cur!=all"><a v-on:click="cur++,pageClick()">下一頁</a></li>
<li v-if="cur == all"><a class="banclick">下一頁</a></li>
<li><a>共<i>{{all}}</i>頁</a></li>
</ul>
</div>
<script type="text/javascript">
var pageBar = new Vue({
el: '.page-bar',
data: {
all: 8, //總頁數
cur: 1//當前頁碼
},
watch: {
cur: function(oldValue , newValue){
console.log(arguments);
}
},
methods: {
btnClick: function(data){//頁碼點選事件
if(data != this.cur){
this.cur = data
}
},
pageClick: function(){
console.log('現在在'+this.cur+'頁');
}
},
computed: {
indexs: function(){
var left = 1;
var right = this.all;
var ar = [];
if(this.all>= 5){
if(this.cur > 3 && this.cur < this.all-2){
left = this.cur - 2
right = this.cur + 2
}else{
if(this.cur<=3){
left = 1
right = 5
}else{
right = this.all
left = this.all -4
}
}
}
while (left <= right){
ar.push(left)
left ++
}
return ar
}
}
})
</script>
</body>
</html>